Baffle for protecting superheater headers



.May 23, 1933. Y H. .J. KERR y1,910,439

.BAFFLE FOR PROTECTING SUPERHEATER 'HEADERS Filed March 9, 1928 ATTORNEY,

Patented May 23, 1933 UNITED STATES pisser' seis@ HOWARD J'. KEER, OF WESTFIELD, NEW JERSEY,V ASSIGNOR `'1111) BABCOCK 85 WILCOX COMPANY, 0F BAYONNE, NEW JERSEY, A CORPORATION F NEW JERSEY' BAFFLE FOR PROTEGTINGVSUPERHEATER READERS Application filed March 9, V19248. Serial'No. 260,288. Y

This invention relates to a single pass boiler or' the Babcock da Vilcox type, that is provided with a superheater and a baille for protecting the headers of the superheater against direct iinpingiiig of the gases thereupon. At

the same time the space between the baflie and the superheater headers is ventilated to avoid danger of explosion. rlhe invention will be understood from the description in connection with the accompanying drawing in which a vertical section of an illustrative embodinient of the invention is shown. ln the drawing reference character 1 indicates a bank of inclined tubes that are connected to down' take headers 2 and uptake headers 8. The downtake headers 2 are connected by downtake nipples l to the water space of the steam and water drum 5, and the upper portions of the headers 8 are connected by rows of steam circulating tubes 6 to the steam space of the steam and water drum 5.

A tube 7 connects the steam space of the steam and water drum 5 to the inlet header 8 of the superheater. The inlet header 8 is ccnnected by the U-tubes 9 to the outlet head-y er 10 and a connection 11 leads from this out-l let header to the steam main.

A baille 12 extends along the upper side of the uppermost row of inclined tubes 1 from the headers 2 to a position slightly beyond the inlet header 8. A battle plate 13 extends across the superheater tubes 9 in iront of the headers 8 and 10, and a bai-ile 14 extends from i near the header 10 along the upper side of the uppermost superheater tubes so that a single gas pass is provided across the inclined tubes 1 and the superheater tubes 9.

arranged with respect to the main bae that it encloses superheater headers in stagnant gases.

This baiiie may vary in length, thus varying the size of the opening through which the gases Abaille 17 extendslfromaposition near the t upper side of, the outlet header 10 and is inclined downwardly and its lower edge 18 terminates some distance from the baffle 12 so that an opening is left between the battlel 17 and the headers 8 and 10 to provide-'communication between the space and the gas stream.V Combustible gases will not, therefore, accumulate in this space and give rise to danger or" explosion'.` The batlie' is'provid-- ed to prevent a stream of hot gases fromlowing across the superheater Lheaders vand the spaceV thus provided is large enough for a workman to gain access to the sup'erheater headers 8 and 10 andthe fittings on the headers. with the headers reachV approximately the temperature of the headers. A support 19 maintains the baffle 17 in position -and the baflie 17 prevents the hot gases from imping-- The gases pass over the tubes as indicated by the arrows and thence between the nipplesd into the stack.

I claim.: 1 l. 1. In a water'tube boiler,a bank of inclined tubes,a superheater above said bank of tubes having-one header above the other, va battle along Vthe upperl side of saidsuperheater extending substantially to the upper header of said superheater, and a baffle extending iii* a downwardly .inclined direction from theupper header of said superheater with its lower edge left free. Y v

2. In a water tube boiler, a bankof inclined y tubes, a baille extending part way alongsaid bank ,of tubes, a superheater above said bankV of tubes having one header above the other, a baille along the upper side of said superheater extending substantially 'to `the upper header of said superheater, and a baffle exe tending ina downwardly inclined direction from the upper header of said superheater with its lower edge terminating short of said v rst named baille.

The gases in this space that cont-act" ing directlyagainst the superheater headers.` Y

3. Apparatus of the class ldescribed coin-'i Y' prising, lin combination7 a water tube steam boiler having straight tubes, a furnacefrom which 'heatinggases pass across the straight tubes for their entire length, a superheater above said tubes, a Z-shaped baiiie having one end part resting on top of the superheater and its remaining parts embracing the superheater headers, and a canopy baiile extending between said remaining parts to Jform a three sided box-like enclosure for the headers.

4. In steam generating equipment7 a water ytube steam boiler having `straight boiler tubes,

a steam "and 'water drum, downcomer nipples extending from the steam and water drum downwardly toward said tubes, Va furnace underneath the boiler and causing heating gases to contact with said tubes over their entire length, a steam superheater having tubes above the boiler tubes, inlet and outlet headers for the superheater, a Z-shaped baile construction interposedA between the furnace and thev headers, and having a long end part above the superheater and extending along the superheater tubes from said headers, and a roof construction including circulator tubes arrangedl above the baffle construction so as to compel the gases turning between the long leg of the battle and the roof to pass horizonnace gases from a first gas pass on the headers, and a second batiie located on the opposite side of the headers from the first and extending in a downwardly inclined direction from the upper header of said superheater with its lower edge left free.

HOWARD J. KEER. -k

tally of the apparatus and leave between the ,y

downcomer nipples.l Y

, 5. In a water tube steam boiler and its furnace, a bank of inclined'tubes extending into the path of the furnace gases, a first baiile extending part way along said bank of tubes,

lupper and lower superheater headers located above said bank of tubes, superheater tubes extending from said headers, a second baille along the superheater tubes and forming substantially an. extension yof theliirst baiiie in deiningla wall of the rst gas pass, and aV i headers without contacting with them, means for diverting the iiow of gases leaving the superheater to a second gas 'pass on the side v of the headers opposite to that occupied by the tubes, and a second baiiie extending past the headers in the direction of iow in the second gas pass to direct the diverted gases out of contact with the headers while providing a chamber open toward they downstream side with reference vto gas movement in the last gas pass and permitting access to the headers when the :boiler is shut down. I

l7. In a watertube boiler, a bank of inclined tubes, a `superheater above said bank of tubes having Vone header'above lthe other,

a first battle preventing impingement of furllO 

